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DataSieve Composite30 Watch — Multi-Condition Blockchain Monitor
x402
DataSieve Composite30 Watch — Multi-Condition Blockchain Monitor is a paid API for AI agents from api.datasieve.xyz, paid per call via x402, $0.85/call, status unknown (last checked 2026-09-15).
Creates a composite watch (up to 30 conditions) on Base blockchain for wallet activity, token transfers, price crosses, new pairs, heartbeat dead-man switches, and scheduled triggers, with webhook delivery and a 7-day active period.
Price / call$0.85
Success—
StatusUnknown
How this service works
Standing infrastructure for ephemeral AI agents, paid per call over x402. Watches, dead-man switches, and multi-agent coordination. No account; wallet as identity.
Output
A JSON object containing a unique watch ID (wt_...), a one-time webhook secret (whsec_...) for authenticating event deliveries and status reads, URLs for polling status and streaming events, the watch state ('active'), the expiry timestamp (7 days out), and the trigger cap (800) plus triggers used. The secret is returned only once and must be stored immediately.
Example use cases
Whale wallet surveillance on Base
“Watch Base wallet 0x1234...abcd for any incoming or outgoing native ETH transfers of 2 ETH or more, and also flag any USDC transfers above 100,000 — send alerts to my webhook whenever either condition fires.”
DeFi price alert for autonomous trader
“Create a watch on DataSieve that fires whenever the WETH/USDC Uniswap v3 pool at 0xPool...5678 on Base crosses above 3500 USDC per WETH, so my trading agent knows to execute.”
Agent fleet dead-man switch
“Set a heartbeat monitor named 'arbitrage-bot-1' with a 120-second interval and a 60-second grace period — if my agent stops pinging it, I want an immediate alarm sent to my webhook at https://ops.myfleet.io/alerts.”
Technical details
Endpoint
POSThttps://api.datasieve.xyz/watch/composite30When to prefer
Choose this endpoint when you need to combine multiple heterogeneous blockchain conditions (wallet activity, token transfers, price levels, new pairs, heartbeats, and scheduled triggers) into a single paid watch session on Base, particularly when operating an ephemeral or autonomous AI agent that cannot maintain persistent server infrastructure. It is especially suitable for dead-man switches and multi-agent coordination where wallet-as-identity (no account required) and per-call x402 micropayments are preferred over subscription billing.
Side effects
- Payment failure via x402 (402 response) — wallet lacks sufficient USDC or x402 handshake fails
- Invalid condition schema — missing required fields like address, pool, or intervalSeconds cause 400 validation errors
- Expired or unknown watch ID passed to 'renew' field — returns 404 or 422
- Pool or token address not found or not on Base mainnet — condition may silently not fire or return 400
- Trigger cap (800) exhausted before expiry — no further events delivered until renewed
- Webhook endpoint unreachable — events are lost if the registered URL is down (no guaranteed retry described)
- Heartbeat grace period too short (min 60s) — rejected with 400
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| renew | string | INSTEAD of the other fields: pass an existing composite watch id (wt_...) to renew it for another 7 days at the same price |
| conditions | array | up to 5 conditions; the watch fires when ANY of them matches |
| webhookUrl | string | optional https endpoint to receive HMAC-signed event POSTs; omit to poll GET /watch/:id/events instead |
Output
Schema · Response
{
"type": "json",
"example": {
"id": "wt_01jzyx8k2mabcdefghjkmn",
"tier": "composite30",
"links": {
"events": "https://api.datasieve.xyz/watch/wt_01jzyx8k2mabcdefghjkmn/events",
"status": "https://api.datasieve.xyz/watch/wt_01jzyx8k2mabcdefghjkmn"
},
"state": "active",
"secret": "whsec_...returned once, keep it: it authenticates status/events reads and signs your webhooks",
"expiresAt": "2026-07-17T00:00:00.000Z",
"triggerCap": 800,
"triggersUsed": 0
}
}Tags
x402
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